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Two New Species of Free-Living Nematodes of the Family Linhomoeidae (Nematoda, Monhysterida) from Mangrove Forests in Vietnam

Gagarin, V. G.
Inland water biology 2019 v.12 no.1 pp. 21-31
Monhysterida, free-living nematodes, male reproductive system, males, mangrove forests, new species, pharynx, rivers, sediments, sensilla, tail, Vietnam
An illustrated description of two species of free-living nematodes of the family Linhomoeidae Filipjev, 1922, new to science, found in the sediments of a thick mangrove forest in the Yên River, Vietnam, is presented. Desmolaimus minor sp. n. is morphologically similar to D. calvus Gerlach, 1956, but has a shorter body, two-separate internal cavity of pharynx, and setiform labial and cephalic sensilla. A review of species of the genus Desmolaimus de Man, 1888 is made, and a pictorial key to determinate valid species of this genus is provided. Terschellingia yenensis sp. n. is similar to T. lissa Timm, 1962 and T. longissimicaudata Timm, 1962. It differs from T. lissa by the presence of precloacal supplements in males, the presence of cervical setae, a longer tail, and shorter spicules; it differs from T. longissimicaudata by a comparatively longer tail, shorter spicules, and a longer dorsal apophysis of gubernaculum.